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Originally Posted by 6DoF
is that common rail injection with integrated rails?
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No its a HEUI system and it stands for hydraulically activated electronically controlled unit injector it was developed by Caterpillar. There is a (HPOP) high pressure oil pump (motor oil) at 3000psi pumped into the oil rails. the fuel is at 60-70psi then the plunger in the injector uses the 3000psi to compress the fuel to 21,000psi. Hope that makes sense. It was one of the first electronically controlled diesels in 1994.5, it's quite a reliable system apparently.